Characterization of poly(vinyl pyrrolidone) modified polyaniline prepared in stable aqueous medium

Abstract Polyaniline (PANI) of high stability and good processibility was prepared in acidic aqueous dispersion/solution, using the support of a water soluble polymer poly(vinyl pyrrolidone) (PVP). The high degree of dispersion and near solubility and storage stability of the PANI prepared, are explained on the basis of the synchronized establishment of hydrogen bonding, between segments of PANI being formed during the polymerization of aniline and the PVP present in the solution. Studies of the prepared dispersions/solutions of the PANI–PVP composites, by viscometry and UV-visible spectrophotometry, lend support to this view. Results of studies of the isolated PANI–PVP composites of different PANI loadings by FTIR spectroscopy, also support this view. The PANI–PVP composites were also thermally characterized, employing thermogravimetric analysis and differential scanning calorimetry (TGA and DSC, respectively). They were characterized microscopically, by transmission electron microscopy (TEM), for the prepared dispersion or solution of PANI in the presence of PVP, and by scanning electron microscopy (SEM) for selected isolated PANI–PVP composites.

[1]  B. Vincent,et al.  Colloidal dispersions of electrically-conducting, spherical polyaniline particles , 1990 .

[2]  R. Brook,et al.  The Encyclopedia of Advanced Materials , 1995 .

[3]  S. Armes,et al.  Novel colloidal dispersons of polyaniline , 1989 .

[4]  S. Chen,et al.  Polyaniline plasticized with 1-methyl-2-pyrrolidone: structure and doping behavior , 1993 .

[5]  S. Armes,et al.  Synthesis of novel polyaniline colloids using chemically grafted poly(N-vinylpyrrolidone)-based stabilizers , 1992 .

[6]  N. Oyama,et al.  Dimercaptan–polyaniline composite electrodes for lithium batteries with high energy density , 1995, Nature.

[7]  P. Molyneux.  Water-soluble synthetic polymers: properties and behavior , 1983 .

[8]  S. K. Chatterjee,et al.  Influence of grafted chain length of a phenolic copolymer on its complex formation with poly(vinyl pyrrolidone) and poly(ethylene oxide) , 1984 .

[9]  M. Wan,et al.  Mechanism of proton doping in polyaniline , 1995 .

[10]  J. Stejskal,et al.  Polyaniline dispersions 2. UV—Vis absorption spectra , 1993 .

[11]  J. Stejskal,et al.  The formation of polyaniline and the nature of its structures , 1996 .

[12]  B. T. G. Tan,et al.  Synthesis and characterization of conducting poly(o-aminobenzyl alcohol) and its copolymers with aniline , 1993 .

[13]  B. Mandal,et al.  Poly(vinyl methyl ether) Stabilized Colloidal Polyaniline Dispersions , 1995 .

[14]  S. Byun,et al.  Preparation and properties of transparent and conducting nylon 6-based composite films , 1994 .

[15]  H. Mark,et al.  Encyclopedia of polymer science and engineering , 1985 .

[16]  J. Stejskal,et al.  Polyaniline Dispersions. 5. Poly(vinyl alcohol) and Poly(N-vinylpyrrolidone) as Steric Stabilizers , 1996 .

[17]  M. Leclerc,et al.  Synthesis and characterization of poly(alkylanilines) , 1989 .

[18]  S. Chen,et al.  Polyaniline Doped by the New Class of Dopant, Ionic Salt: Structure and Properties , 1995 .

[19]  B. Vincent,et al.  Dispersions of electrically conducting polypyrrole particles in aqueous media , 1987 .

[20]  G. Challa,et al.  GLASS-TRANSITION TEMPERATURE OF POLY(N-VINYL PYRROLIDONE) AND EFFECT OF WATER , 1976 .

[21]  J. Stejskal,et al.  Preparation and characterization of aqueous polyaniline dispersions , 1993 .

[22]  E. Ruckenstein,et al.  An emulsion pathway to electrically conductive polyaniline-polystyrene composites , 1993 .

[23]  S. M. Yang,et al.  The properties of polyaniline-polyelectrolyte complexes , 1997 .